Hello, Customer has house at the bottom of a very steep slope that faces the North and has some pine and maples adding to the shade. Soil is slightly acidic. Customer wants to use Rodys and or Azailias to add color and help corrosion on the slope. What would be some reccomendations? We are zone 4-5 and soil does seem rather dry but they say they will water. I haven't done any plantings on slopes or w/Rodys. Any help would be appreciated.